US4672551A - Die machining apparatus in automatic programming - Google Patents

Die machining apparatus in automatic programming Download PDF

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Publication number
US4672551A
US4672551A US06/732,708 US73270885A US4672551A US 4672551 A US4672551 A US 4672551A US 73270885 A US73270885 A US 73270885A US 4672551 A US4672551 A US 4672551A
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United States
Prior art keywords
machining
curved surface
data
die
configuration
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Expired - Fee Related
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US06/732,708
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English (en)
Inventor
Tadashi Ookuma
Shigeshi Murata
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Hitachi Seiki Co Ltd
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Hitachi Seiki Co Ltd
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Assigned to HITACHI SEIKI CO., LTD. reassignment HITACHI SEIKI CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: MURATA, SHIGESHI, OOKUMA, TADASHI
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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/18—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form
    • G05B19/182—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by the machine tool function, e.g. thread cutting, cam making, tool direction control
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/30—Nc systems
    • G05B2219/49—Nc machine tool, till multiple
    • G05B2219/49008—Making 3-D object with model in computer memory
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/30—Nc systems
    • G05B2219/49—Nc machine tool, till multiple
    • G05B2219/49377—Eliminate double cutting

Definitions

  • This invention relates to a die machining apparatus in automatic programming which is applied when a die is machined from a work material by a machine tool, particularly a vertical type machining center.
  • the clamping cutting method is, however, inconvenient in the present state of the art. That is, since the length of the blade of the ball end mill is usually about 3 to 5 times the diameter of the ball, it is impossible to cut deeper than the length of the blade, and even when cutting to a depth which is less than the length of the blade, the available cutting force does not allow for cutting to a desired depth to be accomplished in one operation.
  • machining is conducted as is shown by models in FIG. 6a-6c in accordance with three steps from (C) to (E), thereby forming the traces of a tool, as is shown in (c).
  • the above-described method of machining in three steps, which is shown in FIGS. 6a-6c is disadvantageous in that the portion which is to be completed in conformity with a desired curved shape is subjected to repeated machining, which is a waste of time and means that the total machining time cannot be shortened.
  • this invention has improved the automatic programming method which is used for machining the configuration of a curved surface of a die.
  • the values of X and Y coordinates are calculated by a machining path production device through a curved surface configuration storage device.
  • the value of Z coordinate in the third dimension is obtained by a machining point calculation device. If a curved surface in the Z axis is to be machined two or more times, a judgement circuit decides this and a calculation processing device calculates that the first machining is to be conducted in conformity with the curved surface and the second or later machining is to be skipped for rapid feeding, this decision being stored in a tool path data storage device.
  • FIG. 1(A) is a view of a conventional machining method
  • FIG. 1(B) is a view of a machining method according to the present invention.
  • FIG. 2 is a flow diagram showing the control system of the die machining apparatus in automatic programming according to the invention
  • FIG. 3(A) shows a curve of points Z 1 in the Z axis in the third dimension which represents the points of a die to be machined, the curve bieng a model curve for explaining automatic programming:
  • FIG. 3(B) is a flow diagram of control operation, which is the main part of the present invention.
  • FIG. 4 shows the traces of a tool which is used for machining according to the invention
  • FIG. 5 is a view of models of a conventional method of machining a work material into the configuration of a curved surface of a die
  • FIG. 6(a) is a perspective view of die machining
  • FIG. 6(b) is a view of a model of machining in the Z axis in the third dimension.
  • FIG. 6(c) shows the traces of a tool which is used for machining.
  • FIGS. 1(A) and 1(B) are views of models for comparison between and explanation of a conventional machining method and a machining method according to the invention.
  • FIG. 1(A) showing the conventional machining method
  • the curved portion is cut along the machining line (a) (indicated by the two-dot and dash line) in the direction indicated by the arrow.
  • profile copy machining is also conducted duplicatingly on the curved portion for which cutting has been finished in the previous machining.
  • FIG. 1(B) which illustrates the machining method using a die machining apparatus according to the invention
  • the curved portion is cut along the machining line (c) (indicated by the two-dot dashed line) in the direction indicated by the arrow.
  • the work is cut only along the machining line (d) while the copy machining of the curved portion for which cutting was finished in the (n-1)th machining step is skipped for rapid feeding, as is shown by the arrow (r).
  • FIG. 2 is a flow diagram of a control system of the die machining apparatus in automatic programming conducted according to the invention.
  • the data in respect of the configuration of a curved surface which is now to be machined is loaded into a CPU 1 by a curved surface configuration input device 2 through an input circuit 3.
  • the data of machining modes for example a machining direction such as right, left, vertical or horizontal direction, and the data of machining conditions such as the radius, pitch, or type of a tool are loaded into a CPU 1 by a machining mode and machining condition input device 4, and are input through an input circuit 5.
  • the data which are input from the curved surface configuration input device 2 are stored in a curved surface configuration storage device 6 after they are processed by the CPU 1.
  • the curved surface to be machined is projected to a machining path production device 7 on the basis of the machining modes and machining conditions input from the machining mode and machining condition input device 4 and the machining path of the curved surface is read as two dixensional values of X and Y coordinates.
  • the point of the X and Y coordinates which is obtained by the machining path production device 7 is calculated and converted into a three dimensional point Z by a machining point calculation device 8.
  • the point Z which is obtained by the machining point calculation device 8 is corrected by a tool offset processing device 9 so as to represent path data for the actual tool trace, namely an NC data.
  • the tool path data which is corrected by the tool offset processing device 9 is temporarily stored in a tool path data storage device 10.
  • the tool path data which is stored in the tool path data storage device 10 is displayed on a CRT display device 12 through an output circuit 11, is output to a PTP (paper tape punch) 14 through an output circuit 13, or is output to a PR (printer) 16 through an output circuit 15, and the work is thereby cut into the predetermined configuration of the curved surface by a machine tool such as a vertical machining center.
  • a machine tool such as a vertical machining center.
  • FIG. 3(A) shows the point Z where die machining is conducted as a continuous curve of a cross section, and in the coordinates, the ordinate denotes the value of Z and the abscissa an arbitrary cross section of the two dimensional coordinates X and Y.
  • the machining line in the (n-1)th order is a machining line consisting of a straight line (a)-(b), a curve (b)-(c) and a straight line (c)-(d) and machining has already been finished.
  • a machining line which is the machining line in the (n)th order consists of a straight line (e)-(f), curves (f)-(b), (b)-(c) and (c)-(i) and a straight line (i)-(j).
  • the values Z 1 of the curve which is to be finally formed are continuously judged and calculated in accordance with a flow diagram of control operation as shown in FIG. 3(B).
  • the values Z as referred to the (n-1)th machining level Z oc and the values Z as referred to the (n)th machining level Z cc are first read into the Z oc register 17 for machining level Z oc and the Z cc register 18 for machining level Z cc and machining is executed while comparing and judging those values.
  • FIG. 4 shows the traces of a tool in the invention.
  • the trace follows the curve
  • the trace jumps the duplicated curved portion and travels linearly at a rapid rate of feeding.
  • the data of configuration of a curved surface is input into the curved surface configuration input device 2 and the data of machining modes and machining conditions are input into the machining mode and machining condition input device 4.
  • the data of the configuration of the curved surface is stored in the curved surface configuration storage device 6 and at the same time it is calculated and converted into the values of the coordinates X and Y to which the configuration of the curved surface is projected by the machining path production device 7.
  • a value of the coordinate Z in the third dimension is obtained by the machining point calculation device 8, and on the basis of the data which is input from the machining mode and machining condition input device 4, the judgement circuit 19 judges through the Z cc and Z oc registers 17 and 18.
  • the calculation processing device 20 calculates and produces a program which provides that when several steps of machining are required, in other words, when a curve is divided into several portions in the coordinate Z for machining, the duplicated portion should be machined only in the first step and in the later steps it should be skipped for fast feeding.
  • the program is stored in the tool path data storage device 10, and when a curved surface of a die is actually cut into a predetermined configuration, the program is taken out from the tool path data storage device 10 and is output to an output device such as the PTP 14, which is connected to a machine tool such as a vertical machining center, whereby die machining is executed in the appropriate manner.
  • an apparatus according to the invention can be applied by attaching it to a conventional apparatus without any change in the programming operation, it imposes no burden on an operator.

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  • Engineering & Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Numerical Control (AREA)
US06/732,708 1984-06-27 1985-05-10 Die machining apparatus in automatic programming Expired - Fee Related US4672551A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP59-132404 1984-06-27
JP13240484A JPS6130354A (ja) 1984-06-27 1984-06-27 金型加工における自動プログラミング装置

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US4672551A true US4672551A (en) 1987-06-09

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JP (1) JPS6130354A (enExample)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4884373A (en) * 1986-09-22 1989-12-05 Toyoda-Koki Kabushiki-Kaisha Numerically controlled machine tool
US5321346A (en) * 1990-12-27 1994-06-14 Fanuc Ltd. NC data creation method
US5600759A (en) * 1989-03-20 1997-02-04 Fanuc Ltd. Robot capable of generating patterns of movement path
US5654618A (en) * 1993-09-13 1997-08-05 Dr. Johannes Heidenhain Gmbh Process for the two-dimensional determination of a work-area contour for lathes
US6701211B2 (en) * 2001-09-10 2004-03-02 Siemens Aktiengesellschaft Computer-aided control method for a machine tool

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2633252B2 (ja) * 1987-06-11 1997-07-23 沖電気工業株式会社 半導体記憶装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4355362A (en) * 1980-03-17 1982-10-19 Fujitsu Fanuc Limited Tracer control system
US4370722A (en) * 1980-01-17 1983-01-25 Fujitsu Fanuc Limited Tracer control system
US4456864A (en) * 1980-02-06 1984-06-26 Fanuc Ltd. Clamping tracer control system
US4535408A (en) * 1981-04-01 1985-08-13 Fanuc Ltd. Numerical control machining method and apparatus
US4599022A (en) * 1981-09-14 1986-07-08 Fanuc Ltd. Clamp profiling control method

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5132870A (ja) * 1974-09-10 1976-03-19 Teijin Ltd Tafutetsudokaapetsuto no seizoho

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4370722A (en) * 1980-01-17 1983-01-25 Fujitsu Fanuc Limited Tracer control system
US4456864A (en) * 1980-02-06 1984-06-26 Fanuc Ltd. Clamping tracer control system
US4355362A (en) * 1980-03-17 1982-10-19 Fujitsu Fanuc Limited Tracer control system
US4535408A (en) * 1981-04-01 1985-08-13 Fanuc Ltd. Numerical control machining method and apparatus
US4599022A (en) * 1981-09-14 1986-07-08 Fanuc Ltd. Clamp profiling control method

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4884373A (en) * 1986-09-22 1989-12-05 Toyoda-Koki Kabushiki-Kaisha Numerically controlled machine tool
US5600759A (en) * 1989-03-20 1997-02-04 Fanuc Ltd. Robot capable of generating patterns of movement path
US5321346A (en) * 1990-12-27 1994-06-14 Fanuc Ltd. NC data creation method
US5654618A (en) * 1993-09-13 1997-08-05 Dr. Johannes Heidenhain Gmbh Process for the two-dimensional determination of a work-area contour for lathes
US6701211B2 (en) * 2001-09-10 2004-03-02 Siemens Aktiengesellschaft Computer-aided control method for a machine tool

Also Published As

Publication number Publication date
JPS6130354A (ja) 1986-02-12
JPH0442133B2 (enExample) 1992-07-10

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